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  2. Continuous emissions monitoring system - Wikipedia

    en.wikipedia.org/wiki/Continuous_emissions...

    A small sample of flue gas is extracted, by means of a pump, into the CEM system via a sample probe.Facilities that combust fossil fuels often use a dilution-extractive probe to dilute the sample with clean, dry air to a ratio typically between 50:1 to 200:1, but usually 100:1.

  3. Logarithmic mean temperature difference - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_mean...

    Assume heat transfer [2] is occurring in a heat exchanger along an axis z, from generic coordinate A to B, between two fluids, identified as 1 and 2, whose temperatures along z are T 1 (z) and T 2 (z).

  4. Chiller boiler system - Wikipedia

    en.wikipedia.org/wiki/Chiller_boiler_system

    A chiller boiler system is a hydronic system. It uses water instead of air to heat and cool a structure. A properly designed hydronic system is usually more efficient than a standard forced air system. [1] Chiller boiler systems use radiant heating and cooling or fan coil systems to condition a home or business. This allows for multiple zones ...

  5. Chiller - Wikipedia

    en.wikipedia.org/wiki/Chiller

    A liquid (glycol based) chiller with an air cooled condenser on the rooftop of a medium size commercial building. In air conditioning systems, chilled coolant, usually chilled water mixed with ethylene glycol, from a chiller in an air conditioning or cooling plant is typically distributed to heat exchangers, or coils, in air handlers or other types of terminal devices which cool the air in ...

  6. Refrigeration - Wikipedia

    en.wikipedia.org/wiki/Refrigeration

    The seasonal harvesting of snow and ice is an ancient practice estimated to have begun earlier than 1000 BC. [13] A Chinese collection of lyrics from this time period known as the Sleaping, describes religious ceremonies for filling and emptying ice cellars.

  7. Blast chilling - Wikipedia

    en.wikipedia.org/wiki/Blast_chilling

    Commercial blast chiller Pumpable ice maker and food storage tank Blast chilling is a method of cooling food quickly to a low temperature that is relatively safe from bacterial growth. Bacteria multiply fastest between +8 and +68 °C (46 and 154 °F).

  8. ABM Industries - Wikipedia

    en.wikipedia.org/wiki/ABM_Industries

    ABM's growth continued throughout the post-war years and the company went public in 1962 in the over-the-counter market [10] with Ted serving as chairman and Sydney as CEO. [7]

  9. Ferguson Enterprises - Wikipedia

    en.wikipedia.org/wiki/Ferguson_Enterprises

    Ferguson Enterprises Inc., headquartered in Newport News, Virginia and organized in Delaware, is the largest U.S. distributor of plumbing, heating, ventilation and air conditioning (HVAC), appliances, and lighting to pipes, valves and fittings (PVF), and water and wastewater products. [1]